大今拉麵

public void 作法1()
{
    //建立泛型List的Type物件 (注意:此還沒沒決定型別)
    Type genericListType = typeof(List<>);

    //決定型別，並且轉為Type物件
    Type type = typeof(int);

    //透過MakeGenericType取得已知型別的泛型型別之Type物件
    Type specificListType = genericListType.MakeGenericType(type);

    //建立實體
    IList list = (IList)Activator.CreateInstance(specificListType);

    list.Add(1);
}

public void 做法2()
{
    //使用上更加的精簡
    IList list = (IList)MakeGenericType(typeof(List<>), typeof(double));

    list.Add(1);
}

//直接包成方法
public static object MakeGenericType(Type generics, params Type[] typeArguments)
{
    generics = generics.MakeGenericType(typeArguments);

    return Activator.CreateInstance(generics);
}